AAT Bioquest

What are the differences between tissues and organs?

Posted August 26, 2022

Basis of differentiationTissuesOrgans
DefinitionTissues are groups of specialized cells that are similar in structure and function together as a unitOrgans are made of tissues. They are a self-contained part of an organism that have a vital and very specific function in the body.
ComponentsTissues are composed of cells that are similar in structure and function.Organs may be composed of several different types of tissues.
StructureTissues are evenly distributed structures.Organs are hollow structures.
ComplexityTissues perform a single, relatively simple function in the body.Organs are capable of performing different types of complex functions in the body.
SignificanceTissues are major structural components of organs – they form organs.Organs are the structural components of the organ system in the body.
FunctionsTissues may have unique functions such as protection, movement, communication, or secretion depending on where they occur. Every organ has a unique and vital physiological function in the body. 
RepairTissues can be repaired via regeneration and fibrosis.Repairing the tissues helps to repair the organs as well.
ExamplesExamples include epithelial tissue, nerve tissue, muscular tissue, connective tissue, and ground tissue. Examples include heart, lungs, kidneys, stomach, and intestines.
Additional resources

Ontogeny of lymphoid organs and mucosal associated lymphoid tissues in meagre (Argyrosomus regius)

Cell Meter™ Fixed Cell and Tissue TUNEL Apoptosis Assay Kit *Green Fluorescence*

LysoBrite™ Red DND-99